Anyone familiar with turning on Advanced Inventory? Any good resources or tips/tricks beyond reading through all the help pages?

I believe that requires you to turn on multi-location inventory also if you haven't already? If you don't already have that on, I would pay special attention to the procedures around that. There are some things you have to do as part of turning on MLI that have no option to undo or redo and can cause headaches if you do them wrong. TEST TEST TEST in Sandbox.